Fix false positives for Style/SymbolArray

[koic]

This PR fixes false positives for Style/SymbolArray when %i array containing unescaped [, ], (, or ).

I noticed the following false positive in the RuboCop AST repository:

$ cd path/to/rubocop-ast
$ bundle exec rubocop --only Style/SymbolArray
(snip)

spec/rubocop/ast/node_pattern/lexer_spec.rb:36:9: C: [Correctable] Style/SymbolArray:
Use [:'(', :array, :sym, :'$', :int, :+, :x, :')'] for an array of symbols.
        %i[( array sym $ int + x )]
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^

163 files inspected, 1 offense detected, 1 offense autocorrectable

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
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• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.